/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.aop.framework;

import org.springframework.lang.Nullable;

/**
 * Delegate interface for a configured AOP proxy, allowing for the creation
 * of actual proxy objects.
 *
 * <p>Out-of-the-box implementations are available for JDK dynamic proxies
 * and for CGLIB proxies, as applied by {@link DefaultAopProxyFactory}.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see DefaultAopProxyFactory
 */
public interface AopProxy {

    /**
     * Create a new proxy object.
     * <p>Uses the AopProxy's default class loader (if necessary for proxy creation):
     * usually, the thread context class loader.
     *
     * @return the new proxy object (never {@code null})
     * @see Thread#getContextClassLoader()
     */
    Object getProxy();

    /**
     * Create a new proxy object.
     * <p>Uses the given class loader (if necessary for proxy creation).
     * {@code null} will simply be passed down and thus lead to the low-level
     * proxy facility's default, which is usually different from the default chosen
     * by the AopProxy implementation's {@link #getProxy()} method.
     *
     * @param classLoader the class loader to create the proxy with
     *                    (or {@code null} for the low-level proxy facility's default)
     * @return the new proxy object (never {@code null})
     */
    Object getProxy(@Nullable ClassLoader classLoader);

}
